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Stages of HIV Infection

The U.S. Centers for Disease Control and Prevention (CDC)
classify HIV infection into four stages.1

Stages of HIV infection

Stage 1: There are no
AIDS-related conditions AND the CD4+ cell count is
greater than 500 or the percent of CD4+ cells is at least 29% of all
lymphocytes.

Stage 2: There are no AIDS-related conditions AND the CD4+ cell count is 200
to 499 or the percent of CD4+ cells is 14% to 28% of all
lymphocytes.

Stage 3: The CD4+ cell count is
lower than 200, the percent of CD4+ cells is less than 14% of all lymphocytes,
or an AIDS-related condition is present.

Stage unknown: No information is available on the CD4+ cell count or the
presence of AIDS-related conditions.

In general, the higher the CD4+ count, the less likely it
is that
opportunistic diseases will occur. Most people who
have untreated HIV experience a gradual drop in the number of CD4+ cells. Each
person responds uniquely to this decline.

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